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authorLinus Torvalds <torvalds@linux-foundation.org>2011-01-17 14:43:43 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-17 14:43:43 -0800
commiteee2a817df7c5a6e569f353f8be78cc1b3604bb6 (patch)
treef721beb4712c732702d3383d3c6a52da8b5bbb20 /fs/btrfs/volumes.h
parent83896fb5e51594281720d145164f866ba769abd5 (diff)
parentacce952b0263825da32cf10489413dec78053347 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: (25 commits) Btrfs: forced readonly mounts on errors btrfs: Require CAP_SYS_ADMIN for filesystem rebalance Btrfs: don't warn if we get ENOSPC in btrfs_block_rsv_check btrfs: Fix memory leak in btrfs_read_fs_root_no_radix() btrfs: check NULL or not btrfs: Don't pass NULL ptr to func that may deref it. btrfs: mount failure return value fix btrfs: Mem leak in btrfs_get_acl() btrfs: fix wrong free space information of btrfs btrfs: make the chunk allocator utilize the devices better btrfs: restructure find_free_dev_extent() btrfs: fix wrong calculation of stripe size btrfs: try to reclaim some space when chunk allocation fails btrfs: fix wrong data space statistics fs/btrfs: Fix build of ctree Btrfs: fix off by one while setting block groups readonly Btrfs: Add BTRFS_IOC_SUBVOL_GETFLAGS/SETFLAGS ioctls Btrfs: Add readonly snapshots support Btrfs: Refactor btrfs_ioctl_snap_create() btrfs: Extract duplicate decompress code ...
Diffstat (limited to 'fs/btrfs/volumes.h')
-rw-r--r--fs/btrfs/volumes.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 1be781079450..7fb59d45fe8c 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -20,8 +20,11 @@
#define __BTRFS_VOLUMES_
#include <linux/bio.h>
+#include <linux/sort.h>
#include "async-thread.h"
+#define BTRFS_STRIPE_LEN (64 * 1024)
+
struct buffer_head;
struct btrfs_pending_bios {
struct bio *head;
@@ -136,6 +139,30 @@ struct btrfs_multi_bio {
struct btrfs_bio_stripe stripes[];
};
+struct btrfs_device_info {
+ struct btrfs_device *dev;
+ u64 dev_offset;
+ u64 max_avail;
+};
+
+/* Used to sort the devices by max_avail(descending sort) */
+int btrfs_cmp_device_free_bytes(const void *dev_info1, const void *dev_info2);
+
+/*
+ * sort the devices by max_avail, in which max free extent size of each device
+ * is stored.(Descending Sort)
+ */
+static inline void btrfs_descending_sort_devices(
+ struct btrfs_device_info *devices,
+ size_t nr_devices)
+{
+ sort(devices, nr_devices, sizeof(struct btrfs_device_info),
+ btrfs_cmp_device_free_bytes, NULL);
+}
+
+int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
+ u64 end, u64 *length);
+
#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
(sizeof(struct btrfs_bio_stripe) * (n)))